Brother HLL3290CDW Service Manual page 160

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Vertical streaks
Step
1 Dirt in the paper feed system
A ground wire or ground plate
installation failure (Grounding
2
is not performed correctly.)
3 Dirt on the fuser unit
4 LED ASSY failure
<User Check>
• Clean the corona wire of the drum unit.
• Return the corona wire cleaning tab to the "▲" position.
• This problem may disappear after printing multiple
sheets of paper.
• Refer to <How to clean the drum unit>
dirt from the exposure drum using a cotton applicator.
• Replace the drum unit with a new one.
• Replace the toner cartridge with a new one.
• Wipe the LED ASSY with a soft, lint-free cloth.
(Refer to Fig. 2-15
Cause
Wipe dirt off.
Retighten the screws of each ground wire or
ground plate. Repair the bend of the tray
ground spring of the T1. (Refer to the figure
below.)
Replace the fuser unit.
Replace the appropriate LED ASSY.
Tray ground spring
Paper tray
Fig. 2-18
2-124
to remove the
(P2-118).)
Remedy
<Bottom of paper tray>
Confidential